app_shell: Add support for mouse cursors.

ui/base/cursor/image_cursors.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_WM_IMAGE_CURSORS_H_
-#define ASH_WM_IMAGE_CURSORS_H_
+#ifndef UI_BASE_CURSOR_IMAGE_CURSORS_H_
+#define UI_BASE_CURSOR_IMAGE_CURSORS_H_
 
-#include "ash/ash_export.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "ui/base/cursor/cursor.h"
+#include "ui/base/ui_base_export.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace ui {
+
 class CursorLoader;
-}
-
-namespace ash {
 
 // A utility class that provides cursors for NativeCursors for which we have
 // image resources.
-class ASH_EXPORT ImageCursors {
+class UI_BASE_EXPORT ImageCursors {
  public:
   ImageCursors();
   ~ImageCursors();
 
   // Returns the scale and rotation of the currently loaded cursor.
   float GetScale() const;
   gfx::Display::Rotation GetRotation() const;
 
-  // Sets the display the cursors are loaded for. The device scale factor
-  // determines the size of the image to load, and the rotation of the display
-  // determines if the image and its host point has to be retated.
-  // Returns true if the cursor image is reloaded.
-  bool SetDisplay(const gfx::Display& display);
+  // Sets the display the cursors are loaded for. |scale_factor| determines the
+  // size of the image to load. Returns true if the cursor image is reloaded.
+  bool SetDisplay(const gfx::Display& display, float scale_factor);
 
   // Sets the type of the mouse cursor icon.
-  void SetCursorSet(ui::CursorSetType cursor_set);
+  void SetCursorSet(CursorSetType cursor_set);
 
   // Sets the platform cursor based on the native type of |cursor|.
   void SetPlatformCursor(gfx::NativeCursor* cursor);
 
  private:
   // Reloads the all loaded cursors in the cursor loader.
   void ReloadCursors();
 
-  scoped_ptr<ui::CursorLoader> cursor_loader_;
-  ui::CursorSetType cursor_set_;
+  scoped_ptr<CursorLoader> cursor_loader_;
+  CursorSetType cursor_set_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageCursors);
 };
 
-}  // namespace ash
+}  // namespace ui
 
-#endif  // ASH_WM_IMAGE_CURSORS_H_
+#endif  // UI_BASE_CURSOR_IMAGE_CURSORS_H_